The most important thing before starting was to adjust character to the age of students, it’s never easy.. Here you can see how they evolved and grew up:
Debía hacer un estilo sencillo, con línea a color y sin fondos, lo justo para contextualizar la escena. ¿Cómo es eso? Pues así:

I had to make a simple style, with color lines and without backgrounds, only the necessary elements to contextualize the scene. How can it be done? Here are some examples:

On every unit, the protagonist was a character from universal literature classics. So, I had to do a personal, recognizablebut non popular looking versions of Little Prince, Sherezade, captain Nemo or Baloo…